It's a job for the police. If someone is intentionally harming others in a way that can cause lasting damage, then they need to be dragged in front of a court.
In the US you have a second amendment but in Germany we wouldn't have any issue with simply outlawing or restricting strong laser pointers in a way that prevents kids from possessing them if there's political will to do so.
The Second Amendment has generally not been held to prohibit banning or restricting dangerous objects that are not weapons, nor weapons without plausible self-defense functionality, nor narrow classes of weapon that are popular for reasons other than self-defense. It definitely wouldn't prohibit slapping age limits on the things. (California, where I live, has a ban dating from the Eighties on many martial arts/"ninja" weapons, probably because they were thought at the time to be inordinately popular among young people. Take this how you will;...
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